摘要
研究了不同含量的稀土(La,Ce)元素对AZ31D镁合金显微组织与力学性能的影响。结果表明:添加一定量的稀土元素后,AZ31D镁合金的组织主要由α-Mg基体、β-Mg17Al12相和Al11(La,Ce)3相所组成,β-Mg17Al12相沿晶界呈连续和半连续网状分布。稀土(La,Ce)可有效抑制晶粒的生长,使镁合金晶粒得到明显细化,在稀土含量为1.25%时,镁合金的晶粒最为细小。随着稀土(La,Ce)含量的增加,AZ31D镁合金的硬度、抗拉强度、断面收缩率及耐腐蚀性均先增大后减小,在稀土含量为1.25%的综合性能最好。添加稀土元素后,镁合金断口上有明显的撕裂棱和韧窝,断裂以韧窝和解理断裂的混合形式为主。
Effects of different rare earth(La,Ce)content on microstructure and mechanical properties of AZ31 D magnesium alloy were studied.The results show that the microstructure of the AZ31 D magnesium alloy is mainly composed ofα-Mg matrix,β-Mg17Al12 phase and Al11(La,Ce)3 phase after adding a certain amount of rare earth elements,and theβ-Mg17Al12 phase shows continuous and semi-continuous netlike distribution along the grain boundaries.The rare earth(La,Ce)can effectively inhibit the growth of grains and make the grain of the magnesium alloy get obvious refinement,when the content of rare earth is 1.25%,the grain size of the magnesium alloy is the smallest.With the increase of rare earth(La,Ce)content,the hardness,tensile strength,shrinkage rate and corrosion resistance of the AZ31 D magnesium alloy increase first and then decrease,and the comprehensive performance of the alloy with rare earth content of 1.25%is the best.After adding rare earth elements,there are obvious tearing edges and dimples on the fracture surface of the magnesium alloy,and the fracture is mainly in the mixed form of dimple and cleavage fracture.
作者
张美丽
罗姝淑
韩茜
代卫丽
李春
刘彦峰
ZHANG Mei-li;LUO Shu-shu;HAN Xi;DAI Wei-li;LI Chun;LIU Yan-feng(Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources,Shangluo University,Shangluo 726000,China;Shaanxi Engineering Research Center for Mineral Resources Clean&Efficient Conversion and New Materials,Shangluo University,Shangluo 726000,China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2020年第9期83-90,共8页
Transactions of Materials and Heat Treatment
基金
陕西省教育厅专项科研计划资助项目(20JK0618)
陕西省大学生创新创业训练计划项目(S201911396038)
商洛学院科研项目(18SKY010)。
关键词
镁合金
稀土
显微组织
力学性能
magnesium alloy
rare earth
microstructure
mechanical property
